Mapfile

Mapfile

[Steve Pye]

Hi,

Sorry for bothering you.  I tried the online command-line option pages, but I
couldn't find the option for generating a mapfile for a linked gcc program.
I'm running gcc in a Windows98 Dos Window and generating a Protected
Mode executable.

Can you please let me know what the command line option for generating a
mapfile is?

Thanks kindly,
Steve Pye.

RE: mapfile

[Eljay Love-Jensen]

Hi Ajay,

To generate a map file:
-Wl,-Map,your-map-file.map

To export only specific symbols:
-Wl,--version-script,your-version-file.ver
(You'll have to review the format for the .ver script file.)

HTH,
--Eljay

RE: mapfile

[Ajay Bansal]

But it does not solve the purpose. So.. That means that gcc (RedHat
Linux) does not have anything like sun compilers/hp/windows compiler
have.. i.e. to have a mapfile/symfile & then export only the required
symbols exported/ 


-----Original Message-----
From: Tony Wetmore [mailto:tony.wetmore@solipsys.com] 
Sent: Tuesday, October 28, 2003 10:45 PM
To: lrtaylor@micron.com; abansal@netegrity.com; gcc-help@gcc.gnu.org


> > Does Linux/gcc support a mapfile syntax, so that we can hide/export 
> > symbols in shared lib on Linux as well?
>
> ...if you declare functions or variables as being static... they will 
> only be visible within that compilation unit...

Of course, code within the compilation unit can always pass (or return)
pointers to static elements to code outside the compilation unit.  I
have never done this across shared library boundaries, but I do not see
why it should fail.

Naturally, this might be a kind of kludgy solution to your problem. :)

---
Tony Wetmore
Raytheon Solipsys
mailto:tony.wetmore@solipsys.com
http://www.solipsys.com

RE: mapfile

[Tony Wetmore]

> > Does Linux/gcc support a mapfile syntax, so that we can hide/export
> > symbols in shared lib on Linux as well? 
>
> ...if you declare functions or variables as being static... they 
> will only be visible within that compilation unit...

Of course, code within the compilation unit can always pass (or return)
pointers to static elements to code outside the compilation unit.  I
have never done this across shared library boundaries, but I do not see
why it should fail.

Naturally, this might be a kind of kludgy solution to your problem. :)

---
Tony Wetmore
Raytheon Solipsys
mailto:tony.wetmore@solipsys.com
http://www.solipsys.com

RE: mapfile

[lrtaylor]

-----Original Message-----
From: Ajay Bansal [mailto:abansal@netegrity.com] 

> Does Linux/gcc support a mapfile syntax, so that we can hide/export 
> symbols in shared lib on Linux as well? 

I believe that the ability to hide/export symbols is a function of the
file format and linker more than of the compiler.  Linux uses the ELF
file format, and the indications I've seen are that it doesn't support
what you are asking.  Then again, I know that if you declare functions
or variables as being static (global functions and variables, not class
member functions and variables), they will only be visible within that
compilation unit.  That at least allows you to define and use functions
that won't be visible outside of the library, but it does not allow you
to define functions that can be used in other compilation units in the
library but that aren't visible outside the library.

Then again, someone probably knows better than me that can give a more
definitive answer than "I don't think so..."

Cheers,
Lyle

mapfile

[Ajay Bansal]

 
Does Linux/gcc support a mapfile syntax, so that we can hide/export symbols
in shared lib on Linux as well? 

mapfile

[Ajay Bansal]

 
Does Linux/gcc support a mapfile syntax, so that we can hide/export symbols
in shared lib on Linux as well?